This patch makes /dev/kmem a config option; /dev/kmem is VERY rarelyused, and when used, it's generally for no good (rootkits tend to bethe most common users). With this config option, users have thechoice to disable /dev/kmem, saving some size as well.

A patch to disable /dev/kmem has been in the Fedora and RHEL kernels for4+ years now without any known problems or legit users of /dev/kmem.